IB Bio Lab 3 (organic compounds)

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11 Terms

1
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spot test

which test best indicates fat (lipids)?

2
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Biuret

which test best indicates protein?

3
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Benedict

which test indicates a sugar?

4
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Iodine

which test indicates starch?

5
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the presence of a permanent wet-looking translucent spot

what makes the spot test positive?

6
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change in color to black

What makes the Iodine test positive?

7
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appearance of a lavender color

What makes the Biuret test positive?

8
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blue or some shade of yellow

What makes the Biuret test negative?

9
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green (+), yellow (++), orange (+++), brick red (++++)

what makes the Benedict’s test positive?

10
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purple, and in the absence of the tested material, solution remains blue

What makes the Benedict test negative?

11
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No, it indicates a monosaccharide presence

Will the benedict test, test all sugars? If not, which?